Jerrick Dale, 27, pleaded guilty yesterday to attempted criminal sale of a controlled substance in the third degree, stemming from a drug deal observed by a police officer at the Mariners Harbor Houses Jan. 5.

The plea agreement calls for Dale to serve two years behind bars and 18 months of post-release supervision.

A source said Dale was visiting his aunt when, according to court papers, a cop saw him pass two bags of crack cocaine to another person, who paid him. When Dale was apprehended, he was holding two more bags of crack, court documents charged.

The other person also was arrested and charged.

This is Dale's second drug conviction on Staten Island.

In 1993, he pleaded guilty to fifth-degree criminal possession of a controlled substance and was sentenced to five years' probation.

Dale is due to return April 3 to state Supreme Court, St. George, for sentencing by Justice Stephen J. Rooney.